1# 2# Architectures that offer an FUNCTION_TRACER implementation should 3# select HAVE_FUNCTION_TRACER: 4# 5 6config USER_STACKTRACE_SUPPORT 7 bool 8 9config NOP_TRACER 10 bool 11 12config HAVE_FTRACE_NMI_ENTER 13 bool 14 help 15 See Documentation/trace/ftrace-design.txt 16 17config HAVE_FUNCTION_TRACER 18 bool 19 help 20 See Documentation/trace/ftrace-design.txt 21 22config HAVE_FUNCTION_GRAPH_TRACER 23 bool 24 help 25 See Documentation/trace/ftrace-design.txt 26 27config HAVE_DYNAMIC_FTRACE 28 bool 29 help 30 See Documentation/trace/ftrace-design.txt 31 32config HAVE_DYNAMIC_FTRACE_WITH_REGS 33 bool 34 35config HAVE_FTRACE_MCOUNT_RECORD 36 bool 37 help 38 See Documentation/trace/ftrace-design.txt 39 40config HAVE_SYSCALL_TRACEPOINTS 41 bool 42 help 43 See Documentation/trace/ftrace-design.txt 44 45config HAVE_FENTRY 46 bool 47 help 48 Arch supports the gcc options -pg with -mfentry 49 50config HAVE_C_RECORDMCOUNT 51 bool 52 help 53 C version of recordmcount available? 54 55config TRACER_MAX_TRACE 56 bool 57 58config TRACE_CLOCK 59 bool 60 61config RING_BUFFER 62 bool 63 select TRACE_CLOCK 64 select IRQ_WORK 65 66config FTRACE_NMI_ENTER 67 bool 68 depends on HAVE_FTRACE_NMI_ENTER 69 default y 70 71config EVENT_TRACING 72 select CONTEXT_SWITCH_TRACER 73 select GLOB 74 bool 75 76config CONTEXT_SWITCH_TRACER 77 bool 78 79config RING_BUFFER_ALLOW_SWAP 80 bool 81 help 82 Allow the use of ring_buffer_swap_cpu. 83 Adds a very slight overhead to tracing when enabled. 84 85# All tracer options should select GENERIC_TRACER. For those options that are 86# enabled by all tracers (context switch and event tracer) they select TRACING. 87# This allows those options to appear when no other tracer is selected. But the 88# options do not appear when something else selects it. We need the two options 89# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the 90# hiding of the automatic options. 91 92config TRACING 93 bool 94 select DEBUG_FS 95 select RING_BUFFER 96 select STACKTRACE if STACKTRACE_SUPPORT 97 select TRACEPOINTS 98 select NOP_TRACER 99 select BINARY_PRINTF 100 select EVENT_TRACING 101 select TRACE_CLOCK 102 103config GENERIC_TRACER 104 bool 105 select TRACING 106 107# 108# Minimum requirements an architecture has to meet for us to 109# be able to offer generic tracing facilities: 110# 111config TRACING_SUPPORT 112 bool 113 # PPC32 has no irqflags tracing support, but it can use most of the 114 # tracers anyway, they were tested to build and work. Note that new 115 # exceptions to this list aren't welcomed, better implement the 116 # irqflags tracing for your architecture. 117 depends on TRACE_IRQFLAGS_SUPPORT || PPC32 118 depends on STACKTRACE_SUPPORT 119 default y 120 121if TRACING_SUPPORT 122 123menuconfig FTRACE 124 bool "Tracers" 125 default y if DEBUG_KERNEL 126 help 127 Enable the kernel tracing infrastructure. 128 129if FTRACE 130 131config FUNCTION_TRACER 132 bool "Kernel Function Tracer" 133 depends on HAVE_FUNCTION_TRACER 134 select KALLSYMS 135 select GENERIC_TRACER 136 select CONTEXT_SWITCH_TRACER 137 select GLOB 138 select TASKS_RCU if PREEMPT 139 help 140 Enable the kernel to trace every kernel function. This is done 141 by using a compiler feature to insert a small, 5-byte No-Operation 142 instruction at the beginning of every kernel function, which NOP 143 sequence is then dynamically patched into a tracer call when 144 tracing is enabled by the administrator. If it's runtime disabled 145 (the bootup default), then the overhead of the instructions is very 146 small and not measurable even in micro-benchmarks. 147 148config FUNCTION_GRAPH_TRACER 149 bool "Kernel Function Graph Tracer" 150 depends on HAVE_FUNCTION_GRAPH_TRACER 151 depends on FUNCTION_TRACER 152 depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE 153 default y 154 help 155 Enable the kernel to trace a function at both its return 156 and its entry. 157 Its first purpose is to trace the duration of functions and 158 draw a call graph for each thread with some information like 159 the return value. This is done by setting the current return 160 address on the current task structure into a stack of calls. 161 162 163config PREEMPTIRQ_EVENTS 164 bool "Enable trace events for preempt and irq disable/enable" 165 select TRACE_IRQFLAGS 166 depends on DEBUG_PREEMPT || !PROVE_LOCKING 167 default n 168 help 169 Enable tracing of disable and enable events for preemption and irqs. 170 For tracing preempt disable/enable events, DEBUG_PREEMPT must be 171 enabled. For tracing irq disable/enable events, PROVE_LOCKING must 172 be disabled. 173 174config IRQSOFF_TRACER 175 bool "Interrupts-off Latency Tracer" 176 default n 177 depends on TRACE_IRQFLAGS_SUPPORT 178 depends on !ARCH_USES_GETTIMEOFFSET 179 select TRACE_IRQFLAGS 180 select GENERIC_TRACER 181 select TRACER_MAX_TRACE 182 select RING_BUFFER_ALLOW_SWAP 183 select TRACER_SNAPSHOT 184 select TRACER_SNAPSHOT_PER_CPU_SWAP 185 help 186 This option measures the time spent in irqs-off critical 187 sections, with microsecond accuracy. 188 189 The default measurement method is a maximum search, which is 190 disabled by default and can be runtime (re-)started 191 via: 192 193 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency 194 195 (Note that kernel size and overhead increase with this option 196 enabled. This option and the preempt-off timing option can be 197 used together or separately.) 198 199config PREEMPT_TRACER 200 bool "Preemption-off Latency Tracer" 201 default n 202 depends on !ARCH_USES_GETTIMEOFFSET 203 depends on PREEMPT 204 select GENERIC_TRACER 205 select TRACER_MAX_TRACE 206 select RING_BUFFER_ALLOW_SWAP 207 select TRACER_SNAPSHOT 208 select TRACER_SNAPSHOT_PER_CPU_SWAP 209 help 210 This option measures the time spent in preemption-off critical 211 sections, with microsecond accuracy. 212 213 The default measurement method is a maximum search, which is 214 disabled by default and can be runtime (re-)started 215 via: 216 217 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency 218 219 (Note that kernel size and overhead increase with this option 220 enabled. This option and the irqs-off timing option can be 221 used together or separately.) 222 223config SCHED_TRACER 224 bool "Scheduling Latency Tracer" 225 select GENERIC_TRACER 226 select CONTEXT_SWITCH_TRACER 227 select TRACER_MAX_TRACE 228 select TRACER_SNAPSHOT 229 help 230 This tracer tracks the latency of the highest priority task 231 to be scheduled in, starting from the point it has woken up. 232 233config HWLAT_TRACER 234 bool "Tracer to detect hardware latencies (like SMIs)" 235 select GENERIC_TRACER 236 help 237 This tracer, when enabled will create one or more kernel threads, 238 depening on what the cpumask file is set to, which each thread 239 spinning in a loop looking for interruptions caused by 240 something other than the kernel. For example, if a 241 System Management Interrupt (SMI) takes a noticeable amount of 242 time, this tracer will detect it. This is useful for testing 243 if a system is reliable for Real Time tasks. 244 245 Some files are created in the tracing directory when this 246 is enabled: 247 248 hwlat_detector/width - time in usecs for how long to spin for 249 hwlat_detector/window - time in usecs between the start of each 250 iteration 251 252 A kernel thread is created that will spin with interrupts disabled 253 for "width" microseconds in every "widow" cycle. It will not spin 254 for "window - width" microseconds, where the system can 255 continue to operate. 256 257 The output will appear in the trace and trace_pipe files. 258 259 When the tracer is not running, it has no affect on the system, 260 but when it is running, it can cause the system to be 261 periodically non responsive. Do not run this tracer on a 262 production system. 263 264 To enable this tracer, echo in "hwlat" into the current_tracer 265 file. Every time a latency is greater than tracing_thresh, it will 266 be recorded into the ring buffer. 267 268config ENABLE_DEFAULT_TRACERS 269 bool "Trace process context switches and events" 270 depends on !GENERIC_TRACER 271 select TRACING 272 help 273 This tracer hooks to various trace points in the kernel, 274 allowing the user to pick and choose which trace point they 275 want to trace. It also includes the sched_switch tracer plugin. 276 277config FTRACE_SYSCALLS 278 bool "Trace syscalls" 279 depends on HAVE_SYSCALL_TRACEPOINTS 280 select GENERIC_TRACER 281 select KALLSYMS 282 help 283 Basic tracer to catch the syscall entry and exit events. 284 285config TRACER_SNAPSHOT 286 bool "Create a snapshot trace buffer" 287 select TRACER_MAX_TRACE 288 help 289 Allow tracing users to take snapshot of the current buffer using the 290 ftrace interface, e.g.: 291 292 echo 1 > /sys/kernel/debug/tracing/snapshot 293 cat snapshot 294 295config TRACER_SNAPSHOT_PER_CPU_SWAP 296 bool "Allow snapshot to swap per CPU" 297 depends on TRACER_SNAPSHOT 298 select RING_BUFFER_ALLOW_SWAP 299 help 300 Allow doing a snapshot of a single CPU buffer instead of a 301 full swap (all buffers). If this is set, then the following is 302 allowed: 303 304 echo 1 > /sys/kernel/debug/tracing/per_cpu/cpu2/snapshot 305 306 After which, only the tracing buffer for CPU 2 was swapped with 307 the main tracing buffer, and the other CPU buffers remain the same. 308 309 When this is enabled, this adds a little more overhead to the 310 trace recording, as it needs to add some checks to synchronize 311 recording with swaps. But this does not affect the performance 312 of the overall system. This is enabled by default when the preempt 313 or irq latency tracers are enabled, as those need to swap as well 314 and already adds the overhead (plus a lot more). 315 316config TRACE_BRANCH_PROFILING 317 bool 318 select GENERIC_TRACER 319 320choice 321 prompt "Branch Profiling" 322 default BRANCH_PROFILE_NONE 323 help 324 The branch profiling is a software profiler. It will add hooks 325 into the C conditionals to test which path a branch takes. 326 327 The likely/unlikely profiler only looks at the conditions that 328 are annotated with a likely or unlikely macro. 329 330 The "all branch" profiler will profile every if-statement in the 331 kernel. This profiler will also enable the likely/unlikely 332 profiler. 333 334 Either of the above profilers adds a bit of overhead to the system. 335 If unsure, choose "No branch profiling". 336 337config BRANCH_PROFILE_NONE 338 bool "No branch profiling" 339 help 340 No branch profiling. Branch profiling adds a bit of overhead. 341 Only enable it if you want to analyse the branching behavior. 342 Otherwise keep it disabled. 343 344config PROFILE_ANNOTATED_BRANCHES 345 bool "Trace likely/unlikely profiler" 346 select TRACE_BRANCH_PROFILING 347 help 348 This tracer profiles all likely and unlikely macros 349 in the kernel. It will display the results in: 350 351 /sys/kernel/debug/tracing/trace_stat/branch_annotated 352 353 Note: this will add a significant overhead; only turn this 354 on if you need to profile the system's use of these macros. 355 356config PROFILE_ALL_BRANCHES 357 bool "Profile all if conditionals" 358 select TRACE_BRANCH_PROFILING 359 help 360 This tracer profiles all branch conditions. Every if () 361 taken in the kernel is recorded whether it hit or miss. 362 The results will be displayed in: 363 364 /sys/kernel/debug/tracing/trace_stat/branch_all 365 366 This option also enables the likely/unlikely profiler. 367 368 This configuration, when enabled, will impose a great overhead 369 on the system. This should only be enabled when the system 370 is to be analyzed in much detail. 371endchoice 372 373config TRACING_BRANCHES 374 bool 375 help 376 Selected by tracers that will trace the likely and unlikely 377 conditions. This prevents the tracers themselves from being 378 profiled. Profiling the tracing infrastructure can only happen 379 when the likelys and unlikelys are not being traced. 380 381config BRANCH_TRACER 382 bool "Trace likely/unlikely instances" 383 depends on TRACE_BRANCH_PROFILING 384 select TRACING_BRANCHES 385 help 386 This traces the events of likely and unlikely condition 387 calls in the kernel. The difference between this and the 388 "Trace likely/unlikely profiler" is that this is not a 389 histogram of the callers, but actually places the calling 390 events into a running trace buffer to see when and where the 391 events happened, as well as their results. 392 393 Say N if unsure. 394 395config STACK_TRACER 396 bool "Trace max stack" 397 depends on HAVE_FUNCTION_TRACER 398 select FUNCTION_TRACER 399 select STACKTRACE 400 select KALLSYMS 401 help 402 This special tracer records the maximum stack footprint of the 403 kernel and displays it in /sys/kernel/debug/tracing/stack_trace. 404 405 This tracer works by hooking into every function call that the 406 kernel executes, and keeping a maximum stack depth value and 407 stack-trace saved. If this is configured with DYNAMIC_FTRACE 408 then it will not have any overhead while the stack tracer 409 is disabled. 410 411 To enable the stack tracer on bootup, pass in 'stacktrace' 412 on the kernel command line. 413 414 The stack tracer can also be enabled or disabled via the 415 sysctl kernel.stack_tracer_enabled 416 417 Say N if unsure. 418 419config BLK_DEV_IO_TRACE 420 bool "Support for tracing block IO actions" 421 depends on SYSFS 422 depends on BLOCK 423 select RELAY 424 select DEBUG_FS 425 select TRACEPOINTS 426 select GENERIC_TRACER 427 select STACKTRACE 428 help 429 Say Y here if you want to be able to trace the block layer actions 430 on a given queue. Tracing allows you to see any traffic happening 431 on a block device queue. For more information (and the userspace 432 support tools needed), fetch the blktrace tools from: 433 434 git://git.kernel.dk/blktrace.git 435 436 Tracing also is possible using the ftrace interface, e.g.: 437 438 echo 1 > /sys/block/sda/sda1/trace/enable 439 echo blk > /sys/kernel/debug/tracing/current_tracer 440 cat /sys/kernel/debug/tracing/trace_pipe 441 442 If unsure, say N. 443 444config KPROBE_EVENTS 445 depends on KPROBES 446 depends on HAVE_REGS_AND_STACK_ACCESS_API 447 bool "Enable kprobes-based dynamic events" 448 select TRACING 449 select PROBE_EVENTS 450 default y 451 help 452 This allows the user to add tracing events (similar to tracepoints) 453 on the fly via the ftrace interface. See 454 Documentation/trace/kprobetrace.txt for more details. 455 456 Those events can be inserted wherever kprobes can probe, and record 457 various register and memory values. 458 459 This option is also required by perf-probe subcommand of perf tools. 460 If you want to use perf tools, this option is strongly recommended. 461 462config UPROBE_EVENTS 463 bool "Enable uprobes-based dynamic events" 464 depends on ARCH_SUPPORTS_UPROBES 465 depends on MMU 466 depends on PERF_EVENTS 467 select UPROBES 468 select PROBE_EVENTS 469 select TRACING 470 default y 471 help 472 This allows the user to add tracing events on top of userspace 473 dynamic events (similar to tracepoints) on the fly via the trace 474 events interface. Those events can be inserted wherever uprobes 475 can probe, and record various registers. 476 This option is required if you plan to use perf-probe subcommand 477 of perf tools on user space applications. 478 479config BPF_EVENTS 480 depends on BPF_SYSCALL 481 depends on (KPROBE_EVENTS || UPROBE_EVENTS) && PERF_EVENTS 482 bool 483 default y 484 help 485 This allows the user to attach BPF programs to kprobe events. 486 487config PROBE_EVENTS 488 def_bool n 489 490config DYNAMIC_FTRACE 491 bool "enable/disable function tracing dynamically" 492 depends on FUNCTION_TRACER 493 depends on HAVE_DYNAMIC_FTRACE 494 default y 495 help 496 This option will modify all the calls to function tracing 497 dynamically (will patch them out of the binary image and 498 replace them with a No-Op instruction) on boot up. During 499 compile time, a table is made of all the locations that ftrace 500 can function trace, and this table is linked into the kernel 501 image. When this is enabled, functions can be individually 502 enabled, and the functions not enabled will not affect 503 performance of the system. 504 505 See the files in /sys/kernel/debug/tracing: 506 available_filter_functions 507 set_ftrace_filter 508 set_ftrace_notrace 509 510 This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but 511 otherwise has native performance as long as no tracing is active. 512 513config DYNAMIC_FTRACE_WITH_REGS 514 def_bool y 515 depends on DYNAMIC_FTRACE 516 depends on HAVE_DYNAMIC_FTRACE_WITH_REGS 517 518config FUNCTION_PROFILER 519 bool "Kernel function profiler" 520 depends on FUNCTION_TRACER 521 default n 522 help 523 This option enables the kernel function profiler. A file is created 524 in debugfs called function_profile_enabled which defaults to zero. 525 When a 1 is echoed into this file profiling begins, and when a 526 zero is entered, profiling stops. A "functions" file is created in 527 the trace_stats directory; this file shows the list of functions that 528 have been hit and their counters. 529 530 If in doubt, say N. 531 532config FTRACE_MCOUNT_RECORD 533 def_bool y 534 depends on DYNAMIC_FTRACE 535 depends on HAVE_FTRACE_MCOUNT_RECORD 536 537config FTRACE_SELFTEST 538 bool 539 540config FTRACE_STARTUP_TEST 541 bool "Perform a startup test on ftrace" 542 depends on GENERIC_TRACER 543 select FTRACE_SELFTEST 544 help 545 This option performs a series of startup tests on ftrace. On bootup 546 a series of tests are made to verify that the tracer is 547 functioning properly. It will do tests on all the configured 548 tracers of ftrace. 549 550config EVENT_TRACE_TEST_SYSCALLS 551 bool "Run selftest on syscall events" 552 depends on FTRACE_STARTUP_TEST 553 help 554 This option will also enable testing every syscall event. 555 It only enables the event and disables it and runs various loads 556 with the event enabled. This adds a bit more time for kernel boot 557 up since it runs this on every system call defined. 558 559 TBD - enable a way to actually call the syscalls as we test their 560 events 561 562config MMIOTRACE 563 bool "Memory mapped IO tracing" 564 depends on HAVE_MMIOTRACE_SUPPORT && PCI 565 select GENERIC_TRACER 566 help 567 Mmiotrace traces Memory Mapped I/O access and is meant for 568 debugging and reverse engineering. It is called from the ioremap 569 implementation and works via page faults. Tracing is disabled by 570 default and can be enabled at run-time. 571 572 See Documentation/trace/mmiotrace.txt. 573 If you are not helping to develop drivers, say N. 574 575config TRACING_MAP 576 bool 577 depends on ARCH_HAVE_NMI_SAFE_CMPXCHG 578 help 579 tracing_map is a special-purpose lock-free map for tracing, 580 separated out as a stand-alone facility in order to allow it 581 to be shared between multiple tracers. It isn't meant to be 582 generally used outside of that context, and is normally 583 selected by tracers that use it. 584 585config HIST_TRIGGERS 586 bool "Histogram triggers" 587 depends on ARCH_HAVE_NMI_SAFE_CMPXCHG 588 select TRACING_MAP 589 select TRACING 590 default n 591 help 592 Hist triggers allow one or more arbitrary trace event fields 593 to be aggregated into hash tables and dumped to stdout by 594 reading a debugfs/tracefs file. They're useful for 595 gathering quick and dirty (though precise) summaries of 596 event activity as an initial guide for further investigation 597 using more advanced tools. 598 599 See Documentation/trace/events.txt. 600 If in doubt, say N. 601 602config MMIOTRACE_TEST 603 tristate "Test module for mmiotrace" 604 depends on MMIOTRACE && m 605 help 606 This is a dumb module for testing mmiotrace. It is very dangerous 607 as it will write garbage to IO memory starting at a given address. 608 However, it should be safe to use on e.g. unused portion of VRAM. 609 610 Say N, unless you absolutely know what you are doing. 611 612config TRACEPOINT_BENCHMARK 613 bool "Add tracepoint that benchmarks tracepoints" 614 help 615 This option creates the tracepoint "benchmark:benchmark_event". 616 When the tracepoint is enabled, it kicks off a kernel thread that 617 goes into an infinite loop (calling cond_sched() to let other tasks 618 run), and calls the tracepoint. Each iteration will record the time 619 it took to write to the tracepoint and the next iteration that 620 data will be passed to the tracepoint itself. That is, the tracepoint 621 will report the time it took to do the previous tracepoint. 622 The string written to the tracepoint is a static string of 128 bytes 623 to keep the time the same. The initial string is simply a write of 624 "START". The second string records the cold cache time of the first 625 write which is not added to the rest of the calculations. 626 627 As it is a tight loop, it benchmarks as hot cache. That's fine because 628 we care most about hot paths that are probably in cache already. 629 630 An example of the output: 631 632 START 633 first=3672 [COLD CACHED] 634 last=632 first=3672 max=632 min=632 avg=316 std=446 std^2=199712 635 last=278 first=3672 max=632 min=278 avg=303 std=316 std^2=100337 636 last=277 first=3672 max=632 min=277 avg=296 std=258 std^2=67064 637 last=273 first=3672 max=632 min=273 avg=292 std=224 std^2=50411 638 last=273 first=3672 max=632 min=273 avg=288 std=200 std^2=40389 639 last=281 first=3672 max=632 min=273 avg=287 std=183 std^2=33666 640 641 642config RING_BUFFER_BENCHMARK 643 tristate "Ring buffer benchmark stress tester" 644 depends on RING_BUFFER 645 help 646 This option creates a test to stress the ring buffer and benchmark it. 647 It creates its own ring buffer such that it will not interfere with 648 any other users of the ring buffer (such as ftrace). It then creates 649 a producer and consumer that will run for 10 seconds and sleep for 650 10 seconds. Each interval it will print out the number of events 651 it recorded and give a rough estimate of how long each iteration took. 652 653 It does not disable interrupts or raise its priority, so it may be 654 affected by processes that are running. 655 656 If unsure, say N. 657 658config RING_BUFFER_STARTUP_TEST 659 bool "Ring buffer startup self test" 660 depends on RING_BUFFER 661 help 662 Run a simple self test on the ring buffer on boot up. Late in the 663 kernel boot sequence, the test will start that kicks off 664 a thread per cpu. Each thread will write various size events 665 into the ring buffer. Another thread is created to send IPIs 666 to each of the threads, where the IPI handler will also write 667 to the ring buffer, to test/stress the nesting ability. 668 If any anomalies are discovered, a warning will be displayed 669 and all ring buffers will be disabled. 670 671 The test runs for 10 seconds. This will slow your boot time 672 by at least 10 more seconds. 673 674 At the end of the test, statics and more checks are done. 675 It will output the stats of each per cpu buffer. What 676 was written, the sizes, what was read, what was lost, and 677 other similar details. 678 679 If unsure, say N 680 681config TRACE_EVAL_MAP_FILE 682 bool "Show eval mappings for trace events" 683 depends on TRACING 684 help 685 The "print fmt" of the trace events will show the enum/sizeof names 686 instead of their values. This can cause problems for user space tools 687 that use this string to parse the raw data as user space does not know 688 how to convert the string to its value. 689 690 To fix this, there's a special macro in the kernel that can be used 691 to convert an enum/sizeof into its value. If this macro is used, then 692 the print fmt strings will be converted to their values. 693 694 If something does not get converted properly, this option can be 695 used to show what enums/sizeof the kernel tried to convert. 696 697 This option is for debugging the conversions. A file is created 698 in the tracing directory called "eval_map" that will show the 699 names matched with their values and what trace event system they 700 belong too. 701 702 Normally, the mapping of the strings to values will be freed after 703 boot up or module load. With this option, they will not be freed, as 704 they are needed for the "eval_map" file. Enabling this option will 705 increase the memory footprint of the running kernel. 706 707 If unsure, say N 708 709config TRACING_EVENTS_GPIO 710 bool "Trace gpio events" 711 depends on GPIOLIB 712 default y 713 help 714 Enable tracing events for gpio subsystem 715 716endif # FTRACE 717 718endif # TRACING_SUPPORT 719 720